blob: 189d8f02657424e0d4f32507413ca76361f4be26 (
plain)
1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
35
36
37
38
39
40
41
42
43
44
45
46
47
48
49
50
51
52
53
54
55
56
57
58
59
60
61
62
63
64
65
66
67
68
69
70
71
72
73
74
75
76
77
78
79
80
81
82
83
84
85
86
87
88
89
90
91
92
93
94
95
96
97
98
99
100
101
102
103
104
105
106
107
108
109
110
111
112
113
114
115
116
117
118
119
120
121
122
123
124
125
126
127
128
129
130
131
132
133
134
135
136
137
138
139
140
141
142
143
|
/*
* Copyright (C) 2019 The Android Open Source Project
*
* Licensed under the Apache License, Version 2.0 (the "License");
* you may not use this file except in compliance with the License.
* You may obtain a copy of the License at
*
* http://www.apache.org/licenses/LICENSE-2.0
*
* Unless required by applicable law or agreed to in writing, software
* distributed under the License is distributed on an "AS IS" BASIS,
* WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
* See the License for the specific language governing permissions and
* limitations under the License.
*/
package org.mozilla.thirdparty.com.google.android.exoplayer2.audio;
import androidx.annotation.CallSuper;
import java.nio.ByteBuffer;
import java.nio.ByteOrder;
/**
* Base class for audio processors that keep an output buffer and an internal buffer that is reused
* whenever input is queued. Subclasses should override {@link #onConfigure(AudioFormat)} to return
* the output audio format for the processor if it's active.
*/
public abstract class BaseAudioProcessor implements AudioProcessor {
/** The current input audio format. */
protected AudioFormat inputAudioFormat;
/** The current output audio format. */
protected AudioFormat outputAudioFormat;
private AudioFormat pendingInputAudioFormat;
private AudioFormat pendingOutputAudioFormat;
private ByteBuffer buffer;
private ByteBuffer outputBuffer;
private boolean inputEnded;
public BaseAudioProcessor() {
buffer = EMPTY_BUFFER;
outputBuffer = EMPTY_BUFFER;
pendingInputAudioFormat = AudioFormat.NOT_SET;
pendingOutputAudioFormat = AudioFormat.NOT_SET;
inputAudioFormat = AudioFormat.NOT_SET;
outputAudioFormat = AudioFormat.NOT_SET;
}
@Override
public final AudioFormat configure(AudioFormat inputAudioFormat)
throws UnhandledAudioFormatException {
pendingInputAudioFormat = inputAudioFormat;
pendingOutputAudioFormat = onConfigure(inputAudioFormat);
return isActive() ? pendingOutputAudioFormat : AudioFormat.NOT_SET;
}
@Override
public boolean isActive() {
return pendingOutputAudioFormat != AudioFormat.NOT_SET;
}
@Override
public final void queueEndOfStream() {
inputEnded = true;
onQueueEndOfStream();
}
@CallSuper
@Override
public ByteBuffer getOutput() {
ByteBuffer outputBuffer = this.outputBuffer;
this.outputBuffer = EMPTY_BUFFER;
return outputBuffer;
}
@CallSuper
@SuppressWarnings("ReferenceEquality")
@Override
public boolean isEnded() {
return inputEnded && outputBuffer == EMPTY_BUFFER;
}
@Override
public final void flush() {
outputBuffer = EMPTY_BUFFER;
inputEnded = false;
inputAudioFormat = pendingInputAudioFormat;
outputAudioFormat = pendingOutputAudioFormat;
onFlush();
}
@Override
public final void reset() {
flush();
buffer = EMPTY_BUFFER;
pendingInputAudioFormat = AudioFormat.NOT_SET;
pendingOutputAudioFormat = AudioFormat.NOT_SET;
inputAudioFormat = AudioFormat.NOT_SET;
outputAudioFormat = AudioFormat.NOT_SET;
onReset();
}
/**
* Replaces the current output buffer with a buffer of at least {@code count} bytes and returns
* it. Callers should write to the returned buffer then {@link ByteBuffer#flip()} it so it can be
* read via {@link #getOutput()}.
*/
protected final ByteBuffer replaceOutputBuffer(int count) {
if (buffer.capacity() < count) {
buffer = ByteBuffer.allocateDirect(count).order(ByteOrder.nativeOrder());
} else {
buffer.clear();
}
outputBuffer = buffer;
return buffer;
}
/** Returns whether the current output buffer has any data remaining. */
protected final boolean hasPendingOutput() {
return outputBuffer.hasRemaining();
}
/** Called when the processor is configured for a new input format. */
protected AudioFormat onConfigure(AudioFormat inputAudioFormat)
throws UnhandledAudioFormatException {
return AudioFormat.NOT_SET;
}
/** Called when the end-of-stream is queued to the processor. */
protected void onQueueEndOfStream() {
// Do nothing.
}
/** Called when the processor is flushed, directly or as part of resetting. */
protected void onFlush() {
// Do nothing.
}
/** Called when the processor is reset. */
protected void onReset() {
// Do nothing.
}
}
|
